The antonym for bruteful could be...
angelic, calm, considerate, gentle, homedous, kind, meek, peaceful, pleasant, saintly or warmhearted
Aesthete
Tame, or civilized
Civilized.
The best antonym for pessimism is optimism.
An antonym for the word 'worst' is 'best'.
worst
Worst
A possible, not necessarily the best antonym for conclave is disassemble. Hope this helps
willing
test
harmless
professional
adjust
Manageable.
Celebrate